A kinetic study of the mechanism of esterification of 1-arylethanols in trifluoroacetic acid
作者:Ciaran J. Gillen、Anthony C. Knipe、William E. Watts
DOI:10.1016/s0040-4039(01)90166-2
日期:——
Aryl substituent effects upon the rate constants for the esterification of a series of 1-arylethanols in trifluoroacetic acid are in accordance with a reverse AAL1 mechanism, for which the Hammett reaction constant ϱ = −3.69 has been determined by correlation with σ+ substituent constants. The rates of reaction are ca. 50-fold faster than those for corresponding benzyl alcohols which bear an electron-donating
芳基取代基对一系列1-芳基乙醇在三氟乙酸中酯化的速率常数的影响符合反向A AL 1机理,对于该机理,通过与σ +取代基的相关性确定了Hammett反应常数ϱ = -3.69常数。反应速率为约。比带有给电子芳基取代基的相应苯甲醇的反应快50倍,据信这些苯甲醇也被认为是通过反向A AL 1机理在三氟乙酸中进行酯化的;相反,AC 2机制适用于带有吸电子芳基取代基的苯甲醇。